框架结构抗震中的弹簧模拟，combine14可模拟单向弹簧，算例给出了combine14在框架结构抗震中的弹簧模拟（层间刚度）-Seismic fr a me spring simulation, combin14 can simulate a one-way spring, it gives examples combine14 spring simulation (interlayer stiffness) in the fr a mework of structural seismic