Applied Mechanics and Materials Vols. 580-583

Abstract: The general development plan of Tieshan port is designed to be long and narrow, for which the long wave induced resonance may be problematic. Within the present work, a numerical study on the effects of this kind of resonance is conducted. The simulations are performed with the use of the mild-slope model developed in Ref. [1], which was further validated in the present work to be able to predict reasonable results for the harbor resonance. To evaluate the wave resonance for the plan of Tieshan port, 71 offshore wave conditions with the period ranging from 50s to 400s have been calculated. The rationalities of the numerical solutions are analyzed through comparisons with the theoretical ones, and the general agreement is seen to be reasonable. Some preliminary results for the harbor resonant modes, the resonant periods and the corresponding amplification factors for the plan of Tieshan port have been presented.

Abstract: Based on the third-order theory for bichromatic bi-directional waves in water of finite depth, a set of explicit formulas for the state-of-the art quantities of wave kinematics for horizontal and vertical particle displacements, velocities and accelerations, and wave pressure field is developed, and would be much more accurate and realistic in the design of harbor, coastal and offshore structures and their structural members.

Abstract: This paper briefly introduces the design, construction and wave attenuation effect test of a kind of floating breakwater sheltering deep water aquaculture. This novel floating breakwater structure is composed of 28 standard modules and corresponding anchoring systems, and each standard module comprises a catamaran raft and a wave-attenuating and oscillation-inhibiting device, with a length of 30 m, a width of 7 m, a depth of 2 m and a draft of 1.1 m. Each catamaran raft employs a box-shaped multi-ribbed beam-and-slab structure, and was constructed using high-performance concrete and ferrocement materials and internally filled with polystyrene foam plastics. Each wave-attenuating and oscillation-inhibiting device uses a detachable split box-shaped structure and was pre-fabricated using high-performance concrete, with a length of 2 m, a width of 1.638 m and a height of 2 m. Each standard module is anchored using 6 anchor chains, each of which has an on-floor length of about 25 m. After construction, this floating breakwater system was tested for wave attenuation effect, and the data analysis results show that the floating breakwater system has a wave attenuation effect of up to 50 %.

Abstract: Cyclic characteristic of offshore environmental load may cause the accumulation of foundation settlement and excess pore pressure in the subsoil. This may lead to conditions that jeopardize the structural stability and operability of the wind turbine. This paper discusses the analysis steps of the responses of non-cohesive subsoil under cyclic loads for a gravity base foundation system.

Abstract: With the development of social economy and acceleration of constructions of inland waterway transportations, the adverse impacts on ecological environment are gradually known by people. Under the circumstance of protecting the environment we live, the generalization of technology of ecological bank revetment will be an irresistible trend of the development of inland waterway. Combining the examples of constructions of ecological bank revetments in inland waterways in Jiangsu Province, this thesis presents us the discussion on the structural style, technique features, as well as the application principles of ecological bank revetments, meanwhile puts forward the prospects of technology of ecological bank revetment.

Abstract: In the design and construction code for gravity quay, the inner floor of multi-ribbed buttressed quays generally is divided into two parts to calculate. The part within 1.5 times the rib spacing is as a three fixed edges and one simply-supported slab. The restriction effect of the three fixed edges is the same. However, because of the difference in thickness between vertical plate and rib with the change in the vertical direction of the flow, the effect of them is not the same. It will lead to the result deviating. Sometimes, there will be a phenomenon that the maximum bending moment of inner floor is smaller than the mid-span moment. Finite element software ANSYS was used to make a 3D numerical simulation on a buttressed quay in this paper. Shortcomings in the current code are addressed by comparing the calculation results. This can provide references for engineering design.

Abstract: The article adopts the methods of long shore sediment transport calculation、historic chart comparison and numerical simulation of ECOMSED and analyses erosion-deposition characteristic of the Yangma Island sea area. Research shows that the deposition-dominating areas are located at the southwest of study area, while the beach between Xin’an River and Yuniao River shows slightly erosion trend.

Abstract: Taking Xiamen Xiangshan-changweijiao beach project as an example, study the technology of beach restoration. Xiangshan-changweijiao beach locates at the SE of Xiamen Island, which has already been eroded out. The restoration project was finished by the first step and the beach showed better performance than history after one year evolution. By analyzing the environment of shore, designing beach factors, technology of beach fill placement, study the beach restoration and evolution of artificial beach, inquiry the theory of beach nourishment in China.

Abstract: A three-dimensional physical model was used to study the wave distribution around breakwater in Malaysia Penang. Model tests were carried out by using the L-type action absorption directional wave generator in a 45m×40m wave basin at TIWTE in Tianjin China. The incident wave conditions were checked first in the laboratory and a series steps were introduced to construct the bathymetry and breakwater structure. By comparing the test results, the improved top elevation of breakwater is +4.5m, and the recommendation length of northern part of breakwater is 65m.

Abstract: The high-pile wharf near estuary under wave subjects to great wave force. The wave force can cause destruction of the wharf superstructure. Current research focuses on the case where the forward direction of the wave is perpendicular to or inclined to the wharf front line and mostly applied physics modelling experiments. This paper is to study the case where the wave is parallel to the front line of the high-pile wharf. Take a high-pile wharf near estuary as a model and use the finite element software Ansys to establish the space model. Analysis of internal forces and the destruction of high-pile wharf are made. Meanwhile, the preliminary solution depending on the destruction are proposed, providing references for projects.