Papers by Author: Long Zhu Chen

Abstract: A fitting function of lateral displacement of cemented soil retaining wall was proposed according to several measured data of excavations. On this basis, the retaining wall was treated as a homogeneous elastic vertical beam, whose toe and heel were restricted by a spring constraint but still could be moved and rotated. An analytical formula of the lateral displacement of the retaining wall was deduced with the principle of minimum potential energy with consideration of all the external forces. Compared with some other measured data, the average relative error of the formula was less than 10%, which preliminary indicated the formula’s practical value.

Abstract: It is difficult to apply the common nondestructive method to the pile with an inaccessible head condition. The Parallel Seismic test, however, is a promising method that can be used to deal with such difficulties. On the basis of the physical mechanism of P-wave and S-wave, comparisons of the characteristics of the volumetric and shear strain signals, as well as vertical and horizontal vibration signals have been made, providing the theoretical basis for adoption of P-wave and PS-wave as a combination.

Abstract: This paper proposes a reliable and computationally efficient finite-element model (Partial Fiber Model) for the nonlinear analysis of reinforced concrete (R/C) frames under static and cyclic loading conditions that induce multiaxial bending and axial forces. The beam-column member is composed of three parts: middle elastic and two plastic regions at the two ends of beam. The plastic regions are discretized into longitudinal steel reinforcement and concrete fiber elements. The nonlinear behaviors of the elements are derived from the nonlinear stress-strain relations of the steel and concrete fibers. The global stiffness matrix of beam-column can be deduced from those of mentioned three parts. Numerical examples are calculated to prove the accuracy and efficiency of the model. The results of nonlinear analysis show the validity of the model to describe the nonlinear response of frame subjected to static and cyclic loadings.